A strong mesoscale convective system developed over the High Plains during the previous night.  The system initially drifted northeast, however as the night progressed it began to turn southeast.  The airmass was ahead of the system was fairly unstable with surface dew point values in the mid to upper 60s.  Lifted indices were in the -3 C. range with CAPE values in the 1000 to 2000 J/kg range.  As the MCS turned southeast, it began to gain strength in spite of the fact that it moved through Iowa during the morning hours.  It moved through as an arced line of thunderstorms, producing 55 to 65 MPH winds in many locations.  There were a few reports of hail, however most of the hail was below an inch in diameter.  During the later stages of the systems life, a wake low formed behind the main line.  This produced high winds over a large part of the east third of Iowa.  Winds gusted to near 60 MPH with numerous reports of tree and power line damage.  Trees were reportedly blown down on several homes in Wapello County in the Ottumwa area.  The damage was caused by high winds during this event and not during the thunderstorms that came before, however it is possible the trees may have been weakened by the initial thunderstorms.  Damage was fairly widespread, albeit fairly minor.  Perhaps the reason for the widespread damage was due to the fact that the high winds event featured a southeast wind, whereas most thunderstorms in this area produce wind gusts with a dominant westerly component.  As the storms moved through Mahaska County, lightning struck a house north of Rose Hill.  A fire was started with damage placed at $1,500.

High Wind in POWESHIEK, IOWA
From 08-JUN-05 09:00:00 to 08-JUN-05 11:00:00 (CST)
Magnitude: 50 EG
Property damage: 20K
Reported by: LAW ENFORCEMENT

Hail in HARDIN, IOWA
From 08-JUN-05 05:29:00 to 08-JUN-05 05:29:00 (CST)
Location: ALDEN
Magnitude: 1.00 
Property damage: 5K
Crop damage: 5K
Reported by: LAW ENFORCEMENT

Hail in WAPELLO, IOWA
From 08-JUN-05 09:56:00 to 08-JUN-05 09:56:00 (CST)
Location: OTTUMWA
Magnitude: 0.88 
Property damage: 2K
Crop damage: 5K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WAPELLO, IOWA
From 08-JUN-05 09:58:00 to 08-JUN-05 09:58:00 (CST)
Location: OTTUMWA
Magnitude: 52 EG
Property damage: 5K
Reported by: TRAINED SPOTTER

Hail in HARDIN, IOWA
From 08-JUN-05 05:53:00 to 08-JUN-05 05:53:00 (CST)
Location: IOWA FALLS
Magnitude: 0.75 
Crop damage: 5K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in CLARKE, IOWA
From 08-JUN-05 08:22:00 to 08-JUN-05 08:22:00 (CST)
Location: MURRAY
Magnitude: 52 EG
Property damage: 2K
Reported by: LAW ENFORCEMENT

Hail in CASS, IOWA
From 08-JUN-05 07:06:00 to 08-JUN-05 07:06:00 (CST)
Location: ATLANTIC
Magnitude: 0.75 
Crop damage: 5K
Reported by: BROADCAST MEDIA

High Wind in JASPER, IOWA
From 08-JUN-05 09:00:00 to 08-JUN-05 11:00:00 (CST)
Magnitude: 50 EG
Property damage: 20K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in DAVIS, IOWA
From 08-JUN-05 10:33:00 to 08-JUN-05 10:33:00 (CST)
Location: BLOOMFIELD
Magnitude: 57 EG
Property damage: 10K
Reported by: LAW ENFORCEMENT

Hail in HARDIN, IOWA
From 08-JUN-05 06:10:00 to 08-JUN-05 07:10:00 (CST)
Location: HUBBARD
Magnitude: 0.75 
Crop damage: 5K
Reported by: AMATEUR RADIO

Thunderstorm Wind in WAPELLO, IOWA
From 08-JUN-05 10:15:00 to 08-JUN-05 10:15:00 (CST)
Location: OTTUMWA
Magnitude: 57 EG
Property damage: 10K
Reported by: BROADCAST MEDIA

Hail in UNION, IOWA
From 08-JUN-05 07:32:00 to 08-JUN-05 07:32:00 (CST)
Location: KENT
Magnitude: 1.00 
Property damage: 5K
Crop damage: 5K
Reported by: LAW ENFORCEMENT

High Wind in MAHASKA, IOWA
From 08-JUN-05 09:00:00 to 08-JUN-05 11:00:00 (CST)
Magnitude: 50 EG
Property damage: 20K
Reported by: LAW ENFORCEMENT

High Wind in TAMA, IOWA
From 08-JUN-05 09:00:00 to 08-JUN-05 11:00:00 (CST)
Magnitude: 50 EG
Property damage: 20K
Reported by: LAW ENFORCEMENT

High Wind in BREMER, IOWA
From 08-JUN-05 09:00:00 to 08-JUN-05 11:00:00 (CST)
Magnitude: 50 EG
Property damage: 20K
Reported by: LAW ENFORCEMENT

High Wind in MARSHALL, IOWA
From 08-JUN-05 09:00:00 to 08-JUN-05 11:00:00 (CST)
Magnitude: 50 EG
Property damage: 20K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WEBSTER, IOWA
From 08-JUN-05 04:43:00 to 08-JUN-05 04:43:00 (CST)
Location: FT DODGE
Magnitude: 53 MG
Property damage: 5K
Reported by: AWOS,ASOS,MESONET,ETC

Hail in HARDIN, IOWA
From 08-JUN-05 06:11:00 to 08-JUN-05 06:11:00 (CST)
Location: HUBBARD
Magnitude: 0.75 
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in HARDIN, IOWA
From 08-JUN-05 05:57:00 to 08-JUN-05 05:57:00 (CST)
Location: IOWA FALLS
Magnitude: 0.75 
Crop damage: 5K
Reported by: OFFICIAL NWS OBS.

Thunderstorm Wind in JASPER, IOWA
From 08-JUN-05 08:38:00 to 08-JUN-05 08:38:00 (CST)
Location: COLFAX
Magnitude: 54 MG
Property damage: 5K
Reported by: TRAINED SPOTTER

Thunderstorm Wind in WAPELLO, IOWA
From 08-JUN-05 09:52:00 to 08-JUN-05 09:52:00 (CST)
Location: OTTUMWA
Magnitude: 57 EG
Property damage: 10K
Reported by: TRAINED SPOTTER

Lightning in MAHASKA, IOWA
From 08-JUN-05 10:00:00 to 08-JUN-05 10:00:00 (CST)
Location: ROSE HILL
Property damage: 1.5K
Reported by: NEWSPAPER

Hail in UNION, IOWA
From 08-JUN-05 08:07:00 to 08-JUN-05 08:07:00 (CST)
Location: AFTON
Magnitude: 0.88 
Property damage: 2K
Crop damage: 5K
Reported by: POST OFFICE

Thunderstorm Wind in POWESHIEK, IOWA
From 08-JUN-05 09:41:00 to 08-JUN-05 09:41:00 (CST)
Location: SEARSBORO
Magnitude: 61 EG
Property damage: 10K
Reported by: GENERAL PUBLIC

High Wind in BUTLER, IOWA
From 08-JUN-05 09:00:00 to 08-JUN-05 11:00:00 (CST)
Magnitude: 50 EG
Property damage: 20K
Reported by: LAW ENFORCEMENT

High Wind in BLACK HAWK, IOWA
From 08-JUN-05 09:00:00 to 08-JUN-05 11:00:00 (CST)
Magnitude: 50 EG
Property damage: 20K
Reported by: LAW ENFORCEMENT

Hail in JASPER, IOWA
From 08-JUN-05 07:49:00 to 08-JUN-05 07:49:00 (CST)
Location: NEWTON
Magnitude: 0.88 
Property damage: 2K
Crop damage: 5K
Reported by: LAW ENFORCEMENT

High Wind in MARION, IOWA
From 08-JUN-05 09:00:00 to 08-JUN-05 11:00:00 (CST)
Magnitude: 50 EG
Property damage: 20K
Reported by: LAW ENFORCEMENT

Hail in APPANOOSE, IOWA
From 08-JUN-05 09:20:00 to 08-JUN-05 09:20:00 (CST)
Location: MORAVIA
Magnitude: 0.75 
Crop damage: 5K
Reported by: GENERAL PUBLIC

Hail in JASPER, IOWA
From 08-JUN-05 07:50:00 to 08-JUN-05 07:50:00 (CST)
Location: NEWTON
Magnitude: 1.00 
Property damage: 5K
Crop damage: 5K
Reported by: TRAINED SPOTTER

Hail in STORY, IOWA
From 08-JUN-05 06:10:00 to 08-JUN-05 06:10:00 (CST)
Location: ZEARING
Magnitude: 0.75 
Crop damage: 5K
Reported by: OFFICIAL NWS OBS.

High Wind in WAPELLO, IOWA
From 08-JUN-05 09:00:00 to 08-JUN-05 11:00:00 (CST)
Magnitude: 50 EG
Property damage: 20K
Reported by: LAW ENFORCEMENT

High Wind in MONROE, IOWA
From 08-JUN-05 09:00:00 to 08-JUN-05 11:00:00 (CST)
Magnitude: 50 EG
Property damage: 20K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in GRUNDY, IOWA
From 08-JUN-05 06:45:00 to 08-JUN-05 06:45:00 (CST)
Location: BEAMAN
Magnitude: 50 EG
Property damage: 2K
Reported by: TRAINED SPOTTER

High Wind in GRUNDY, IOWA
From 08-JUN-05 09:00:00 to 08-JUN-05 11:00:00 (CST)
Magnitude: 50 EG
Property damage: 20K
Reported by: LAW ENFORCEMENT